ISSN   1004-0595

CN  62-1224/O4

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叠层式气体箔片推力轴承静动态特性试验研究

Experimental Static and Dynamic Characteristics of Multi-layer Gas Foil Thrust Bearing

  • 摘要: 气体箔片轴承因其高运转速度和低摩擦优势,广泛应用于国防军工领域. 近年来,叠层式气体箔片推力轴承由于其良好的环境适应性和更大的变形适用性而备受关注. 本研究中通过改变载荷、激振力频率、幅值、预紧力和转速等试验条件,系统研究了这些因素对轴承静、动态性能的影响. 在探究轴承静态刚度的试验中,随着负载增加,轴承的刚度呈非线性递增趋势. 在旋转推力盘不转的试验中,从时域和频域角度验证了计算方法的可靠性,并分析了在不同预紧力、激振力幅值和频率下的动态特性. 此外,通过研究回滞曲线面积的变化,探讨了不同工况因素对能量耗散的影响. 试验结果表明:随着预紧力和激振力幅值增加,刚度和阻尼增加;随着频率的增加,阻尼降低,同时频率的增加会改变回滞曲线的相位. 在旋转推力盘转动的试验中,进一步探讨了气膜形成对轴承刚度和阻尼的影响. 试验结果表明:由于气体黏度低,承载力和阻尼低,有气膜时的轴承刚度和阻尼低于旋转推力盘不转时的水平. 本文中研究结果为优化叠层式气体箔片推力轴承的结构提供了有价值的参考.

     

    Abstract: Gas foil bearings are widely used in the field of national defence because of their advantages of high speed and low friction. In recent years, the multi-layer gas foil thrust bearing has attracted much attention due to its good environmental adaptability and greater deformation adaptability. This study systematically studied the influence of these factors including load, frequency and amplitude of excitation force, preload force and speed on the static and dynamic performance of bearings. In the experiment of exploring the static stiffness of bearing, the stiffness of bearing showed a nonlinear increasing trend with the increase of load. The reliability of the calculation method was verified from the time domain and frequency domain in the experiment without rotating, and the dynamic characteristics under different preload and vibration amplitude were analysed. In addition, the influence of different working conditions on energy dissipation was discussed by studying the change of hysteresis curve area. The experimental results showed that the stiffness and damping increase with the increase of preload and excitation force amplitude. As the frequency increased, the damping decreased, and the increase in frequency changed the phase of the hysteresis curve. The influence of gas film formation on bearing stiffness and damping was further discussed in the experiment with rotating. The experimental results showed that the stiffness and damping of bearing with gas film formation were lower than those without rotating because of the low gas viscosity, bearing capacity and damping. The research results of this study provided a valuable reference for optimizing the structure of multi-layer gas foil thrust bearings.

     

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